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/*
* $Id: MessageInputStream.java,v 1.3 2004/06/08 19:05:28 dog Exp $
* Copyright (C) 2002 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU inetlib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
package gnu.inet.util;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
/**
* A utility class for feeding message contents to messages.
* This stream returns -1 from <code>read</code> when the stream termination
* sequence LF,END,LF is read from the underlying stream.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
* @version $Revision: 1.3 $ $Date: 2004/06/08 19:05:28 $
*/
public class MessageInputStream extends FilterInputStream
{
/**
* The stream termination octet ('.').
*/
public static final int END = 46;
/**
* The line termination octet ('\n').
*/
public static final int LF = 10;
protected boolean eof;
protected int buf1 = -1;
protected int buf2 = -1;
protected int markBuf1;
protected int markBuf2;
/**
* Constructs a message input stream connected to the specified input stream.
*/
public MessageInputStream (InputStream in)
{
super (in);
eof = false;
}
/**
* Reads the next byte of data from this message input stream.
* Returns -1 if the end of the message stream has been reached.
* @exception IOException if an I/O error occurs
*/
public int read () throws IOException
{
if (eof)
{
return -1;
}
int c;
if (buf1 != -1)
{
c = buf1;
buf1 = buf2;
buf2 = -1;
}
else
{
c = super.read ();
}
if (c == LF)
{
if (buf1 == -1)
{
buf1 = super.read ();
if (buf1 == END)
{
buf2 = super.read ();
if (buf2 == LF)
{
eof = true;
// Allow the final LF to be read
}
}
}
else if (buf1 == END)
{
if (buf2 == -1)
{
buf2 = super.read ();
if (buf2 == LF)
{
eof = true;
}
}
else if (buf2 == LF)
{
eof = true;
}
}
}
return c;
}
/**
* Reads up to b.length bytes of data from this input stream into
* an array of bytes.
* Returns -1 if the end of the stream has been reached.
* @exception IOException if an I/O error occurs
*/
public int read (byte[] b) throws IOException
{
return read (b, 0, b.length);
}
/**
* Reads up to len bytes of data from this input stream into an
* array of bytes, starting at the specified offset.
* Returns -1 if the end of the stream has been reached.
* @exception IOException if an I/O error occurs
*/
public int read (byte[] b, int off, int len) throws IOException
{
if (eof)
{
return -1;
}
int c, end = off + len;
for (int i = off; i < end; i++)
{
c = read ();
if (c == -1)
{
len = i - off;
break;
}
else
{
b[i] = (byte) c;
}
}
return len;
}
public boolean markSupported ()
{
return in.markSupported ();
}
public void mark (int readlimit)
{
in.mark (readlimit);
markBuf1 = buf1;
markBuf2 = buf2;
}
public void reset () throws IOException
{
in.reset ();
buf1 = markBuf1;
buf2 = markBuf2;
}
}
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